They asked about my studies, and then we discussed about the project they have and then they gave some technical challenges to solve. we agreed on a deadline for sending the answer of the challenges . after sending the correct answers, they called me and asked about when we should start the career.

A short (15-30 min) interview with mostly Technical guys, no HR person or someone like that. they ask about your education, work experience and your abilities. they don't get it too hard so calm down and trust in who you are!